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In our 4WD we often carry some Ryobi 18 V tools, a chainsaw, electric secateurs and a compact reciprocating saw for clearing overgrown tracks.

Trim all the branches way back, a foot further than the path edge.
Then take to the light stuff with a slasher as Barry says or a decent pair of hedge shears.

Silky, grab something you can use later for tramping or for the car. Or just go big.
https://silkystore.co.nz/collections/pruning-saws